I use this (probably not enough time to worry about making one before you brew):

The bag is the paint strainer bags from Home Depot.

ive read about those DIY hop spiders before. they seem to be very basic to build. all you need is a PVC collar, 3 lag bolts, some nuts to go on it, and a hose clamp. definatly worth doing if you can pull it off.

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Granite Coast Brewing Company.Building a clone of The Electric Brewery to use as a pilot system for new recipes!